Brush-holder.



F. W. REEVES.

BRUSH HOLDBR 7 APPLICATION FILED MAR.7,1910.

- Patented Nov. 29, 1910.

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r I I J APPLICATION FILED MAR. I, 1910,

-UNITED STATES PATENT ornion.

FREDERICK W. REEVES, OF PITTSBURG, PENNSYLVANIA,-ASSIGNOR TO'THE ELECTRIC ACCUMULATOR COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION 015 NEW JERSEY.

ianosn nonnnn.

Application filed March 7, 1910i Serial No. 547,685.

- a citizen of the United States, residing :at,

Pittsburg N. S, in the county of Allegheiiy and State of'Pennsylvania, have invented. certain new and uwful Improvements in Brush-Holders; and I do declare the follow ing to be aful-l, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of n'eference marked thereon, which form a part vot' this specification. 4

My invention has for its object to provide a simple and practical form of brush holder, for either commutators or collector rings, in which the yieldable pressure is disposed ionritudinally thereof and distributed equally throughout the breadth of their active surface, thus insuring a perfect engagement at all times, and under all conditions. Other objects of the invention are, to reduce the friction of the brushes with the commutator or rings and cause said brushes to readily respond to any inequalities of surlace in said commutator or collector rings.

VVit-h the above objects in view, the invention consists in certain novel features of construction, and in certain parts, improvements and combinations, as will hereinafter be more fully described and pointed out in the appended claims.

In the accompanying drawings, forming a part of this specification, Figure 1, is an end elevation of the holder having the brushes disposed at an angle of ninety degrees to one another. Fig. 2, is a plan view of the same. Fig. 3, is an end elevation of a portion of the same, partly in section. Fig. 4, is an and elevation of. a modified form of the holder, and Fig. 5, is a plan view thereof, inlall of which views, like detail parts are designated by like numerals of reference.

By further reference to said views, particularly Figs. 1 to 3, inclusive, it will be observed that the structure comprises a yoke portion 1 adapted to engage over asuitableprojection of one of the fixed hearings, (in the usual manner) and be retained in its adjusted position by the sct-screw 2. This yoke has secured to each projection 3 there of, a laterally disposed arm 5, which are each insulated therefrom by the insulating material 4:, said arms being each provided at its free extremity with a [brush holding guide 6 disposed transversely thereof, which arms and guides constitute the holder proper.

Logsely arranged within the brush holding guide of each arm isra carbon brush, each comprising thetwo plates 7 and 7, of equal thickness and'arranged one on top of the other, the division thereof being on a line with the axis of rotatiouof the commutator-with which they operate, the brushes in this instance being shown disposed at an angle of ninety degrees with. one an other.

Each carbon forming a'brush is providcd at its outer end with a cap 8, secured thereto by a setscrew 59, which cap is provided at each end with a screw 10 loosely fitted within an opening thereat and provided with a thumb-nut 11, the intermediate portion of the cap being provided with a fixed screw 12 having a thumb-nut l3 thereon to form a Patented Nov. 1910.

binding post for the connection of the con ductor therewith.

Each of the brush holding slides 6 has pivotally secured to its opposite sides, by i'neans of a screw 6, an equalizing bar it, the ends ofuvhich are con vccted to the inner ends of the'screws 10 byspiral springs 15,

so that when the brushes are in engagement with the commutator, shown by dotted outlines 16, pressure is placed upon the brushes in the same direction in which they are dis posed, which pressure allows the brushes to yield and maintain cohtact with the commutator equally throughout their breadth of surfacelat all times and under all conditions. liurthcrinore, the brushes being each formed of two parts, each under a yieldable'pressure, independent of one another, contact is always assured in the passing of the same from one commutator scgi'ncnt or bar to the other, said pressure being regulated by ad-- justincnt of the aforesaid tlunnb-nuts 11.

At Figs. 4 and 5, a modification of-thc structure is shown for use with collector a screw 27, to one side of the brush slide.

The form of brush holder shown at Figs. 1 to 3, inclusive is designed more particularly for use in connection with my in proved commutator for which i filed application for patent on December at, 1909, Serial forms of commutators with good results.

Having thus fully shown and described my invention, What I claim and desire to secure by Letters Patent, is:

1. A brush holder, comprising a holder proper, a pair of brushes slidably arranged therein, and means to place a yieldablc pressure longitudinally on said brushes and equalize the same laterally.

2. A brush holder, comprising a holder proper, a pair of brushes slidably arranged thereon, and yieldable members disposed at opposite sides of said brushes to place pres sure longitudinally thereon and equalize the same laterally. I

3. A brush holder, comprising a holder proper, a pair of brushes slidably arranged thereon, a cap carried by each brush an equalizing bar pivotally secured to the holder and disposed transversely of each brush, and a spiral spring connecting each end of the brush caps with the ends of the equalizer. I

l. A brush holder, comprising a holder proper, a pair of brushes slidably arranged The cap 23 i of each brush is also provided with a bind 1 mg post 28 for connection with a conductor. 1

an equalizemcee thereon, a cap carried by each brush, adjusting screws carried b cap, equalizing bars (lisp d trans e l to the brushes and pii'ota y secured to the holder, and spiral springs connecting the ends of the equalizing bars with the said caps.

5. "i brush holder, eomprisin a holder proper, a pair of brushes slilabl arrangelil thereon, each including a pair of plates one disposed on the other, and means to place a yieldable pressure on each brush plate in-' dependent of the other and equalize the same No. 531,289, but it is obvious that the same I may, with slight changes in the positioning of the brushes, be employed with other laterally.

6. A brusn holder, compr sing a holder proper, a pair 01' brushes slidably arranged thereon, each including a pair of plates one l l l disposed on the other, and a yicldable meniber disposed at each side oi. each brush plate to place a longitudinal pressure thereon and equalize the same laterally, the pressure on one of said brush plates being independentof the other.

7 A brush holder, comprisin a brush holder proper, a pair of brushes ldably arranged thereon, each in cluding a pair of plates one disposed on the other, a cap carried by each brush plate, a pair of adjustin screws carried by each cap, a pair of equalizing bars pivotally secured to the holder on opposite sides of each brush, and a spiral s wring connecting each adjusting screw Witht 1c equalizing bars, each of said brush plates having the spring pressure applied thereto independent 

